12. Two planes A and B are flying in formation. One plane is directly above the other. At a particular moment, there horizontal distance from a person standing at X is 8 km. At the same moment their true direct distance from X are 17 km and 10 km respectively. (Use Pythagoras rule.)
(i) calculate the vertical height of plane A.
(ii) calculate the vertical height of plane B.
(iii) Calculate the vertical height between the two planes.
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